I dated a girl once with a hearing impairment -- she was deaf in one ear, impaired (mostly high frequency) in the other. She had a strobe light smoke detector in her room.

One night I stayed over and woke up to the fire alarm (roommate had burnt some popcorn). She slept right through the alarm and I had to wake her.

She said she'd upgrade to a "bed shaker" alarm. Not sure how well that worked out, we stopped dating shortly after (end of semester).

The Wasabi alarm sounds interesting, but if it's defeated by a blocked nose, maybe the bed shaker type is better.